It's been a few weeks since I've posted anything and I was looking around this morning at some WK's with lifts and the 4.7L with 3.73 gear ratio. I have a 3.7L with 3.07 gears in the rear. If I want to do a 2.5 inch lift with 265/70/17 Trail Grappler's, would it be a bad choice to regear when I lift? Or would that kill my MPG's? I'm averaging 13.3 now that I have my Rola on top. I know if I did regear, it wouldn't increase power, it'd be an increase in torque. But would it be significant enough to where I would notice it? And can I even regear the 3.7L from 3.07 to 3.73 gears?

Yes it will be a significant boost in performance. But you will take a hit on mpgs because the engine will be turning more rpms then before. I am about to purchase the parts needed for a regear on my rwd 3.7. Im going up to a 3.73 ratio and upgrading to a lsd. You will be turning 3-500 more rpms at 60mph but you will boost acceleration by a few tens to almost a second. ..

EDIT: you will need a dealer to recalibrate the tcm, otherwise the transmission will go into limp mode

Yes it will be a significant boost in performance. But you will take a hit on mpgs because the engine will be turning more rpms then before. I am about to purchase the parts needed for a regear on my rwd 3.7. Im going up to a 3.73 ratio and upgrading to a lsd. You will be turning 3-500 more rpms at 60mph but you will boost acceleration by a few tens to almost a second. ..

EDIT: you will need a dealer to recalibrate the tcm, otherwise the transmission will go into limp mode

Yes it will be a significant boost in performance. But you will take a hit on mpgs because the engine will be turning more rpms then before. I am about to purchase the parts needed for a regear on my rwd 3.7. Im going up to a 3.73 ratio and upgrading to a lsd. You will be turning 3-500 more rpms at 60mph but you will boost acceleration by a few tens to almost a second. ..

EDIT: you will need a dealer to recalibrate the tcm, otherwise the transmission will go into limp mode